I need 8 amps of current at 5v for my LED strip.
Probably not.
Most "jumper wires" are 28 to 24 gauge, which is a bit small for 8A.
See: AMP Chart – Cooner Wire
Look at Adafruit's NeoPixel Uberguide and Power Injection.
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I already bought an 8 amp power supply. Would I have to cut it because I cant get wires in an adapter?
Because the wires on the actual strip look thick enough to take 18 amps and theoretically they must be able to take it
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I don't want to cut anything, I just want to be capable to supply 8 amps into the LED strip.
By theoretically I mean that the LED strip that i bought needs to be able to take 18 amps or it is useless to some.
I'm trying to figure out if I need to cut it becuase I can't use an adapter and jumper wires
It didn't. The power supply looks like a laptop charger.
And how would I connect a DC jack to the two wire connections?
I don't see anything about the actual connection part. But it doesn't involve an adapter and jumper wires due to amp requirements
My LED strip doesn't have a DC jack connection anywhere
If you are telling me to plug the jack into my Arduino, the 5v pin can only supply a maximum of 500 ma, as that is the maximum an Arduino can draw
Nope. I take it all back.
What now?
Get a piece of wire thick enough to carry the current. Like standard 1.5 mm2mains wiring. Those strips are not good enough for 8A, they can barely handle 1A.
Connect it to your strip at one end, and then run the wire in parallel connecting to it every 100 or so pixels. The strip has sections where you will find solder points, that are great points to connect your main power cable.
You may use the same 5V power supply to power your Arduino (use the 5V pin). Otherwise, connect the strip ground also to your Arduino ground.
Connect the signal line to the pin of your choice; have fun.
That's it.
By the way, if you need 8A for the strip and plan to use this continuously, get a power supply that can do more. 10-12A or better. You don't want to stress it out, and those Chinese made ones are generally overrated so you have to compensate for that.
If you want me to get mains wiring, then why can't I cut the DC cable (it isn't one of those power supplies that require cutting a AC cable)? Because if it doesn't work, then the power supply is literally unable to fulfill its purpose even if I buy wires
So just connect the power supply directly to the strip and see if it works.
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When you are told to take a piece of AC cable, this does not mean that you need to cut it off from your power supply - you need to take the cable somewhere else, for example, buy it in a store. It doesn’t matter at all whether it is an AC cable or a DC cable - the main thing is that it has a sufficient thickness.
To properly power the strip, you must connect power in several places, as I wrote to you in the last thread.
It means you have to solder it yourself.